We invite you to participate in CodeChef’s September Cookoff, today — 19th September from 9:30 PM — 12:30AM IST.
The contest will be 3 hours long. There will be 7 problems in Div 1/2 and 8 problems in Div 3. It will be rated for all three Divisions.
Joining us on the problem setting panel are:
Contest Admins: Ashish Ashishgup Gupta and Anton antontrygubO_o Trygub
Head Admin: Alex Um_nik Danilyuk
Tester: Anshu _runtimeTerror_ Garg
Setters: abc864197532, Ashish Ashishgup Gupta, Utkarsh Utkarsh.25dec Gupta, Rahim Nots0fast Mammadli, flamestorm, Anirudh Krishna, Chaithanya Dragonado Shyam, Amruth amruth_kumar Kumar Tadikamalla, Kimi Wu, Manuj DarkSparkle Nanthan
Statement Verifier: Trung Kuroni Dang
Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu, Bharat Singla
Mandarin Translator: Qingchuan qingczha Zhang
Russian Translator: Fedor Mediocrity Korobeinikov
Bengali Translator: Mohammad solaimanope Solaiman
Vietnamese Translator: Team VNOI
Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.
Prizes:
Global Rank List:
- Top 10 global Division One users will get $100 each.
- Non-Indians will receive the prize via money transfer to their account.
- Indian users will receive Amazon vouchers for the amount converted in INR.
Indian Rank List:
- Top ten Indian Division One coders will get Amazon Vouchers worth Rs. 3750 each.
- The rest in the top 100 will get Amazon Vouchers worth Rs. 1500 each.
- First-time winners in Div 2 who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.
- First-time winners in Div 3 players who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.
The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.
Good luck and have fun!
Admin Note:
I would like to welcome Anton antontrygubO_o Trygub and Yahor 244mhq Dubovik who have recently joined CodeChef and will be admins of CookOff and Lunchtime as well.
The winners of July CookOff to August Lunchtime have been finalized and will receive an email in the coming week.
First Comment! xD
Will Anton still coordinate Codeforces Rounds?
Yes
When will you distribute prize of August cook-off?
Ask when July Cook-off prizes will get distributed! xD
I just got a mail an hour ago confirming the prizes for the July and August Cookoff. (I suppose July Lunchtime was also processed but I didn't give that contest)
The actual vouchers (for Indian top participants) haven't been sent yet though.
Yes I also got confirming mail about prizes for July Lunchtime
Am I the only one who hates the timing of CodeChef Cookoff?
Well , you are not the only one.
.
Are there any prizes for non-indian div 3 participants?
How to solve Permutation and GCD set?
I got that if $$$m > log(n)$$$ or $$$s_{1} > 1$$$ the answer is 0 since its only possible if $$$s_{(i - 1)}$$$ divides $$$s_i$$$ for all $$$i > 1$$$ and the $$$gcd(a_1, \ldots, a_n) = 1$$$.
After that I got the $$$O(n logn)$$$ expected value dp idea (placed $$$i$$$ digits and at gcd $$$s_j$$$, prob of moving to $$$(i + 1, s_j)$$$ is $$$((n / s_j) - i) / (n - i)$$$, similar for $$$s_{j - 1}$$$)
But I have no clue how to solve this any faster.
Also really liked Pairdist and Half Sequence. Chess Kings felt a bit too standard for its position.
Oof, I missed the contest. How come Codechef CookOff happened on the 19th? Doesn't it usually happen in the last weekend before the next month?
As a participant, I loved the small and clear statements this time. Specially loved the problem Half Sequence
How to solve CKCGAME?
Here is some feedback:
Overall, it was a very good contest. Thank you to the authors!
Problem .Half Sequence, please explain anyone .
I never cared about cheaters. I always knew that these ratings are just numbers that have no value in the outside world, but today during the contest, when my rank was around 15-20 (in div 3) for more than 2 hours, and suddenly it dropped to 300, I realized that it is not just a rating that gets affected, but the whole motive of "competition" goes into vain.
These are just my personal opinions. I am not going to write some blogs or anything for these cheaters but just wanted to tell these cheaters don't even understand the meaning of "competitive programming."
Is it normal for people like you to have rank around 15-20 in div3? This was just my first codechef contest and I finished at rank 302 there. Started slow, but gradually went up in ranks. And I messed up the FAKESWAP problem, so I can't say that I was particularly happy about my performance.
I registered at codechef only thanks to this announcement on CF. Because I have high expectations of their new admins. And I think that some of the top positions in the div3 scoreboard may be occupied by new registrants IF there was any significant influx of new users. Or maybe you are right and just a spike of cheating explains it all.
Any directions on what we need to do to get the coupon code , I have got the mail today , but don't know when and where to find coupon code
are the prizes for August LunchTime rolled out? or even any confirmation mail